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【单选题】
（）通常是设置在内部网络和外部网络之间的一道屏障，它可以防止网内计算机受到来自网络外部的攻击和入侵。A.
认证技术
B.
加密技术
C.
防火墙
D.
防病毒软件
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举一反三
【判断题】The"Barn of America"is located in what American politicians call “Middle America”.
A.
正确
B.
错误
【单选题】The common barn owl, one of ten species of barn owls found in North America, is also called the monkey-faced owl because its heart-shaped face looks ______ of a monkey.
A.
like much that
B.
like that much
C.
much like that
D.
that much like
【单选题】The high, sharp, rugged Rocky Mountains to the east of the Pacific Ocean are called ______.
A.
the Father of Mountains
B.
the Barn of America
C.
the Backbone of America
D.
the King of Mountains
【判断题】The "Barn of American" is located in what American politicain call "Middle America".
A.
正确
B.
错误
【单选题】Which of the following statements is NOT true? ____
A.
The Five Great Lakes form part of the border between the US and Canada.
B.
Hoover Dam is built on the Columbia River.
C.
The Great Mississippi River Basin is known as the “ Barn of America ” .
D.
The United States has 48 states on the continent.
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